Recovery mode will cause some drivers to not be loaded. So that might
explain the lack of brightness control.

Please try booting normally, expecting it to fail. Then reboot again
into recovery and run:

  journalctl -b-1 > journal-1.txt
  journalctl -b-2 > journal-2.txt

and attach the resulting text files here.


** Package changed: gnome-shell (Ubuntu) => ubuntu

** Changed in: ubuntu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2115484

Title:
  am unable to adjust auto brightness

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